Plastic forming of polymer-metal blends for the fabrication of ceramic matrix composites
Abstract
New multiphase ceramics derived from polymer-metal-precursor blends in the quinary Me-Si-N-C-O-systems with Me = Ti or other group IV-VI elements can be brought into ceramic shapes by means of plastic forming techniques and subsequent pyrolysis. Rheological properties were measured in the present study using a rotary viscosimeter to characterize the flow behavior of the viscous blends up to 200 C. During pyrolysis at temperatures of 800 C to 1400 C the reactive metallic filler particles react with decomposition products of the polymers to form carbide or (carbo-)nitride phases dispersed in a silica, siliconoxycarbide or siliconoxynitride matrix. The ability of forming complex shapes and the reaction of polymer decomposition products with reactive fillers in order to obtain porosity controlled microstructures makes this processing route a promising new approach to polymer-derived ceramic matrix composites.
- Publication:
-
In: Advanced structural inorganic composites (A93-37948 15-23
- Pub Date:
- 1991
- Bibcode:
- 1991asic.proc..555S
- Keywords:
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- Ceramic Matrix Composites;
- Fabrication;
- Forming Techniques;
- Polymer Blends;
- Silicon Carbides;
- Silicon Nitrides;
- Oxynitrides;
- Porosity;
- Pyrolysis;
- Shear Stress;
- Titanium Compounds;
- Viscosity;
- Mechanical Engineering